Star Wars: The Clone Wars returns with an epic four-episode arc that leads into the season finale, and return of the universe's most notorious Sith. This week, in "Massacre," Count Dooku is determined to have revenge against the Nightsisters of Dathomir after their betrayal. General Grievous launches an all-out droid attack against the magic-wielding witches, and Mother Talzin and Asajj Ventress lead the defense with all the dark powers at their command.